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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d92edfad0f4d6473dbcd0864744fd5512d61d4ee6e12bbb489d32b875f06c7' 
  AND token = 'iXa2HZOVSxi7SuyTE/hBMO4M0F714iwKNgjNnTbfscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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