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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5334041d54bdef15d0a771713ef61fb6e39abe6fd84db8b3a36933df9490fca6' 
  AND token = '797yGMrN3BjgQlf+eNDU0eCH49O6pw1tAAA9bZ56TZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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