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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abde6cd6b7732c0ebc5db672ef96b2ab0ae2c8cf8585beefb4bfea3462685113' 
  AND token = '4pfB4OzOirWTN57QNeTn0uyS5yRrtet6gVe+50AKP78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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