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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd009dd48425a1596e395e3896774005f67ccf966b480f7852920b0e04ec508c0' 
  AND token = 'moaTiaSZRBQQcC16GmKd14doegViz9BlnnG5Ida59bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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