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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2365f27b12448d51e05beb7bc57a5a23986c8e4414a426fa7701b258ac83a5' 
  AND token = 'NrPj6SeT/ZbxQuVwr8Fq/orIT+OP63i8WXmJewfOWv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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