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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0767f93f1c599f9dece6c2cc61a3a72d29cb614092c6dcb2b1c5817ab91c4b29' 
  AND token = 'TFULoVSuNyZ5ps7uttLt1pXnKOBVxl8Wy4f+RCTpVCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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