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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabf5bac8274baf449a2eda0db7eff2aa2214a94201e020dd4531c70a7a250b5' 
  AND token = '922DDsZ+H3o9twrU463v6j7rhU2aj6tFfgCHpKCHyoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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