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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b265a6d24a0a420429e1449f6c50aec8148ecc6f4b7de89d5f65a9e74c62792' 
  AND token = 'wZksahfiBlZP1+S/XJ91CaEyT+q+En0xrgNkzJdaJdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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