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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c77f66cd9660bbf1cd54322cdafdb9a741eb08a305a5d56f1fa2f04f0024c0' 
  AND token = 'kGeuHeoW9x4pIa70m8xksLtKzVLHzLBXhPK3BExj84k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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