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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8bdae528cf8842f1f065c494cc506b2f3788441f00f2818336b5caf82e9307' 
  AND token = 'tZ3Xlxu3Oe17T/lOrB+u0uDoLpj68X0ewcK+a/oKwgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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