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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8760dd6ae33c9f5db4367e01cbe21237ede11ff9129adb4a8154fcf4349f8eb' 
  AND token = '9lkz1+uQ4MTGPO4ADP1FqqQm/B2a392i79MrGYlOmeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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