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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ccaddbfa28b6de4fb5802ef71248d74c3459adf5adb4b574c2d224f4602d601' 
  AND token = 'l3CeRYfCTn4zeDY9W4NB21jsLlXaCkkjp4EkKZgc3Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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