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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eb8132261feac03e437557122f111d0d87486ece7e62ea5637565681ab4875d' 
  AND token = '8kuuq3aWdttvtCZz+FbS4ksltAQhfzx1e3W0dCeNRes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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