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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa1dae0ef97b411b0232e80098cf2ff86128dc6e5aa3b52e0cc6d964279b593' 
  AND token = 'cBCEM4AAVo3xPeTNSBdkWluhTepNjl0L9p14NeFsxAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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