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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e378907230899e8cb216b02182021ff26cb10feb3cde3b703f66b626f3b5358d' 
  AND token = 'n7BEaYGlxkqIs6mFdLnrvEHZeW14a6tEtr9yBoulxvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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