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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea358a427c988e607bf8a8d9e5b862a8953a59b7054c572db55c96b6557a589' 
  AND token = 'REJzpQIo8IkCgOCPaoZ+gjBTcqLewml8ekLImdBhOI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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