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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f4313d94d0872d5ec1decf01a81b5e11d0a783d6b8f5e0dcec3b83d0bdb26f' 
  AND token = 'WU6zqxwn9I0Tlg4td08opjq4k7jqggb1ATB29D5G5tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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