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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e933fefe3fb28afd8693c988831a8fa14a6c79d39b4f72fbc5ceb8298eb4ad' 
  AND token = '4PtC1r05UaOA1rBH5qjjW7gBmPOIkgUNL4EcdfkXDSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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