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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20927c4aacd9b16d28d28b4f2bef47bc71a860aa0248bf49c8d0adc5827fb5f2' 
  AND token = 'uKFoh05qDh0DzV2867UgFqNvi5ivx8u5xrGOwapFr44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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