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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf6a3a89cbb53dbcc9c97119d06d1dc8e858774e971c9b1718e5259208cc6fb' 
  AND token = 'P9x8zP9JZ+I3ZidH2SHf5C4HPjnLp/s71ybqSfyHAng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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