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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936984557756017a871ea83b22ece82c9ad012d54eba1ed413f9e8f9b0c04e66' 
  AND token = '9NbN9Kmhnrr7VOvHG8IdAIEfr4CJjNbEJm5/dAdtCFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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