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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7f14e39b651c3b36c77437d1ac078ae4e9c06e3d3b1aef2242a3679c8a0a68' 
  AND token = 'rEorRPBDF7BuodlomrfKm8mwuSoUfYyQb/Z/mpzbHg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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