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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9295ba602d53ad29d2db650cba9d690fe3e8bad18d84118a5453fd6e8bdad5f0' 
  AND token = '1x8U8o6sWKhQzGvQ2EEaUKg4zHLHjg18rAC+d16170s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00169

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}