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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058d09b4340318c6efca63d7d3442c19fa7191de1e7868c7a738c1c8b3a50c9c' 
  AND token = 'mX6k0c0nCusWtk5E3eZgnwcVrTF8LAUEMLrpleOr2sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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