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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685e4d7e6fd1c9a3bd5c501f2a9c320fa4d77045740850180c18a0953d336d24' 
  AND token = '/yjcyONtehbXEoUHJk0uBOUFgf9or12Vx7ThkV7GkZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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