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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66eff901e5e3fc61e052d9fcef8e5d449a568e618cd7bea6e3b8854c2ff61e29' 
  AND token = '3vn9kbHpabnCxEeV8CDhkLXU/mFM0aohXDx75xk3Uj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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