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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a1eaf0405288cd1d9f5705824bd4556229ff8992c4225b0c5bc052f0fd477f' 
  AND token = 'Ydpj9pmx36gicUgtnPGdwjW34BaxTywPt/IrfcXq4mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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