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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f337e8b6d36394891a63dc575c37222514d66347c687ab89a33557a40d66a0' 
  AND token = 'UtQeUdF2G5a9awhjVnY+q1Zb5SRlHdSoYg8Z7z4H6B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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