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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7140aef1b4d6d76ec4338e61b9f1baa3255374691767e284e2ecd710fb66f9c8' 
  AND token = '6GqY99/411FOtmEej4i/jnbv/i6eO5rdcDs2d4Mt01s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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