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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde11fce67782a7bff4aa4cc2e03b776285041d6db5c744057b1d00c8d592083' 
  AND token = 'gvB2r0G5hsxd9aEBklZ+ixEHba5A4T/G9TWOxPl4LUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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