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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96443f40b1394962183f38e6d6cd4e229352789ec372d7fba0d50fb46e27d72' 
  AND token = 'uA9ucZHi75OKr7VaNK3BzA6BfqZO4CV9U9Sorry+o2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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