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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b48a0e34248432f8881728b2cfe6398d0efc12b3c0d7434539789651083f6c0' 
  AND token = 'SF0k0e1PhR7m2sJMjykdaLuZKxkXEoaxLDAF5rRaSd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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