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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c83336169d924b59eff511347d11c4eb3f1c1d3c06029b42ee3dfdefeb6a86' 
  AND token = 'SG+RvESMxe2Js1225F5Ya2xOhKEomy2BSJW3va+XM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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