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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a31e59700dfd44f9e0fa1fef94df87872f0f8cce529dce95074717f1562312d' 
  AND token = '8eoR1z0UZQYBf43tN8pFWI3oeT2RkaEACb2XUPFUt/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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