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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b013e79de7d2ef45c5e8a89f724ada82015561839876139f83d65e3de23e9f8' 
  AND token = 'lGPH+Q0QFPDNsyB7GTFcFj+sRnJDPT9oxsTCpr4ei5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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