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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f66676ac58dba3c9ef2b73f65e88866359d4163e9080e571e24c87fcecfe73' 
  AND token = 'L+fIaUkeoX/Yl/gKcRyYrlmGoQksY6mrUzXaQNIo6SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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