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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84e2e041672b80adf545c2cd829918218b7cf52db12c10b09e17b24e18cf077' 
  AND token = 'T/SE5T1ffaXzB1bbRNAg6gABVgRyUhZpXQvbU7PG3j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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