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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f396fac990bae8c2a75dbf1706961c802a236edde46e74e78b514e47a462aad' 
  AND token = '6doqpsI3MR+xdYLqfvN32yHw/BdueuIGWce4UVQTQ4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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