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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d03e173549bc5aceeadec794a94c6972542a89c17ac8bde51ee3ac0d4c1cfe4' 
  AND token = 'zFyxSUO4LjhsFUdOTO2ny2Kre4ns1y8f/KEFBDwB7Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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