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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01a1e2082aeba6700e8eb41d4301ee97f632274b76b8396b1103539924553016' 
  AND token = 'SzCWdZE7sk9kyA/tYeTQc+YCsPeUQVAtO8LjoeH6CL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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