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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdf865291716216deeb6d69b488cea8d5bc121347eac16e1429768b098f5b24' 
  AND token = 'etIjOXmQ9GIftAWsesBg5xdn1SaagrNh1kvgA9Fp2S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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