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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1797bfba699eed33161897b379086296b48bd5b5e931dfb81c00ef193454140' 
  AND token = 'nM6nwqqY11f6iN7Z01A620OVKJPe7/c6JECZqsxgk6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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