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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a01c84c2b0b7f695a9c4cf5c6d0037d40f16a6451d63bbff2244d027f1b0c5c' 
  AND token = '30V5JnjWEPFHKK78zioMfvQgtoNvxhJa1t0+MTcBlxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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