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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b73798656476827d20164cc94e998513d929e1104e77746342e554b400b3c05' 
  AND token = 'b7ga2pGxajAmD9h9smN7qAzqHadCkB4BB51RoygkeYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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