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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0f7a90503067557157a503b7d140b7ab47cd63c45a3c31b141ec120633b766' 
  AND token = 'RVUPQ6v8kdystfl0NLdX7M8mFBhLB9XfLpxPudwFYH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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