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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42669400f98290fa936e5cd7c47989d34ea1f728ce69ca99059ccc39c8ff2021' 
  AND token = 'qYu7cKjk3qV4bF88N/SQH7fu/nM0T8lyJQA51a5K+Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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