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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53f62ddd39c64a7356f62ba5ff57fe45d71b589543af2086a02db09dc9f8031e' 
  AND token = 'MRs7LuePmli8pIRAM9S8JORx+p7dplqKYtRc/BhdZK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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