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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ba4b82ed286f89826275c3a74008554bcbfb7940ce73675984b8a8fab71df7' 
  AND token = 'tqMzSsPez0/pgthuWO+vAR+BS4n1xt3e+Ap10JgDmdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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