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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6d4573f4a7674035ecffd8f4e95469ba2e3f5a619d8233e2a2c8f06ba3f3a8' 
  AND token = 'KqTicREoVuULM1cQ7SVGv1Rbvp5rQ8NaGGowXxGCWq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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