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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aacbc9606388ea3b6b448c55131378c8322fc55a9266dcd0f94f26ecd90daec' 
  AND token = 'dGxeYEO1ru/BnjetgDqPANsFRIK9NiwPJAnsGSevavM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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