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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845b910530556d0cfb3ad1d7e637f87e7ed9ee2d09dfa4e991754307cd22ef6a' 
  AND token = 'ZRObx0EXk99ge3bUb7W706uwfvaV3eQDUyfS2JAQTfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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