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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3746db5ba658746051525824495f1871f8e8be913d91fcfbe4710830c11bbf3b' 
  AND token = 'pOT28P09nLvnoI51nEs7breFNMC4iHVnCaofIWhB6Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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