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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a12f9cda788dcf63c2adafba37f58a50e74cc7fd7e1638b6124927ce757adf' 
  AND token = 'uw8p1wNNdrHB680cw3tApUsfBvRuZ2fHlUueuNGprFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00417

JSON explain

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