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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab90caa5f54356cbe1670e2231f3063ecc625b7bd0f610b5dea01d4b859cb4fa' 
  AND token = 'PhOAdAdjV43DhUpB9BEEkVMdQ+uxPmYRiq2Fi6w8rF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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